Lighting appliance for gas-lamps.



No. 835,117. :PATENTED NOV,- 6, 1906.

v SLS'HAW. LIGHTING APPLIANCE FOR GAS LAMPS.

APPLIOAZ IOI FILED APB. 6,1904.

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T OFFICE. SAMUEL sHAw, or EAST RIGHMOND,IVICTORIA, AUSTRALIA.

LIGHTING APPLIANQE FOR GAS-LAMPS.-

Specification of Letters Patent. Application filed Apri15,19p4. Serialo. 201,637.

Patented Nov. 6, 1906.

i To all whom it may concern:

Be it known that I, SAMUEL SHAW, a subject of the King of Great Britain,residingat 50 Chestnut street, East Richmond, in the State of Victoria,Australia, have invented certain new and useful Improvements in LightingAppliances for Gas-Lamps of which the following is a specification.

This invention provides improvements in fittings or appliances adaptedfor use in con:

nection with those incandescent gas-lamps in.

which the illuminating power is raised to a very hi h degree by theemployment in the lam 0? a lon suction or mixin tube. My app ianceena%les such lamps to be lighted or extinguished by the turning on oroff of a tap that is arranged in a convenient position in the gas-pipeleading to the lamp. Thus a lamp may be set outside in the street, thetap for lightin same being Within the building to which theTamp isconnected. I

In order to make the invention clear, I will proceed to describe samewith reference to the accompanying sheet of drawings, in which Figure 1shows vertical section of the appliance fitted to a lamp of the classabove mentioned. Fig. 2 shows sectional plan of same, taken on line A Aof Fig. 1.

I employ a small cylinder a, having a shoulder that forms a seat a for avalve and a neck af of less diameter, said neck being screwthreadedexternally and covered by a cap m, that has perforations m preferablyfour. The c linder a screws onto a tube 1). The top of t e tube 6 formsa seating for a valve 0, and the cylinder a forms a box for the saidvalve. The cylinder 0, rests at its base on a flange 12, formed on thetube b. The valve carries a spindle c and this spindle extends through aperforated uide-piece 0 set across the tube 12. The tu e b is internallythreaded at its base I) to fit upon the gas-sup ly pipe k. A branch pipe61 proceeds at rig t angles from the tube 1), the bore of the said pipebeing less than that of the tube just described. A small vertical pipe6, having an internal bore of about one-sixteenth of an inch indiameter, is carried by the pipe (1, and a screw-pin f is provided toadjust the opening at the base of the said pipe. The top of the tube 6is made roughly in the form of a valve-seat, the edges being serratedwith knife-cuts to allow of leakage of gas when valve is on its seat.Such valve consists of a small steel ball g An exterior vertical tube hsurrounds the tube e and rests upon the pipe d, the top of the tube Itbeing formed internally as a seat for the ball-valve and having aperforation. The valve 0 is constructed, preferably, out of a piece ofElite metal, and its bulk forms about one-t 'solidor in form of a cup,and its top may have a broad groove cut across its diameter, so as toprevent the top of the valve when moved upward by a strong pressure ofthe gas from completely closing in the top ofthe dome I from the gasbelow; but in practice the valve will not rise to the dome, but will be,lifted from its seat sufiiciently to allow passage of gas to theburner.

The construction so formed is designed to fit into the lamp of the classabove referred to. The cylinder 0, with the cap m, lies within thesuction-pipe l of such lamp ,and the tube It lies within an enlarged endor bell l of the small pilot or lighting-tube Z that leads to theinterior of the burner, to provide for a continuous small light when themain light is extinguished. The base of the tube 6' rests upon a cup F,that supports the suction or mixing pipe Z and allows of the admissionof air to same. By these means it is possible to readily remove andreplace the burners and mixer-tube and the upper end of the pilottubetogether with the mantle.

In operationmy invention works as follows: A small by-pass pipe isarranged at the gassupply cocksay within the room or any otherconvenient distance from the burner. Through this small supply-tube theas continually flows past the stop-cock su cientl to find its way up toand under the small bal valve 9, where it escapes or leaks away throughthe serrated cuts to and up the tube 1 at the top of which itcontinuously burns, while the main burner is not alight. When it isdesired to light the main burner, the main gas-su ply cock is turned on,so as to allow the fulFsupply and pressure of gas to proceed forwardunder the specially-constructed circular valve 0 of the burner. Thepressure of such gas lifts the valve 0 a sufficient height and allowsthe gas to proceed up to the main burner above, where it 'is ignitedfrom the small pilot-light hereinbefore referred to.

Meanwhile, owing to the increased pressure and volume of gas accumulatinat the small ball-valve g, the ball will be b own upward against the topof the tube It, thus practically extinguishing the small light burninwhile the main burner is lighted. The balT-valve,

d of a sphere and which maybe i the main burner.

however, does not close opening so but that there is. always a'slightleakage-of gas sufii, cient to maintain the small light, while the Theperforated cap m willpreventany roaring noiseas'the-gas entersthesuctionf pipe Z'fronrthe cylinder aand which is at- 4 present anobjectionable feature inconnecappliance is not in use.

tion with the use of these lamps where my 1 "Having thus describedmyinvention, what Iclaim;and-desire to secure by Letters Pat- A burner forincandescent'lamps comprising amain-valve casing, avalve therein con- 1trolled, as to its opened'or closed oonditionf, 7-*by= the intensity'of'the gas-pressure; a pilotiburner device connected with said valve-cas-111% back of the mainzvalve and containing a va ve controlled by theintensity of the gas- -pressure to OPGIIOIlGlOSG it oppositely to themain valve, a bell surrounding said parts and provided with air-inlets,a miXing-tube forming an upward extension of said bell and adapted tocarry the mantle, a cap for the main valve-casing having a plurality ofdischarge-openin s discharging upwardly into said miXing-tu e and a tubeleading from the pilot-valve casing intothe mixing-tube and thenceupwardly to the ignition-pointof the burner.

In testimony whereof I have=signed-my name to this specification in thepresence of two subscribing witnesses.

SAMUEL SHAW.

-Witnesses:

A. O. SAcHsE, A. HA'RKER.

